Which of the Following Is the Probability Mass Function of the Bernoulli

Multiple Choice

Which of the following is the probability mass function of the Bernoulli distribution?

A) $\left\{\begin{aligned}p & \text { if } x=1 \\1-p & \text { if } x=0\end{aligned}\right.$

B)


C) $\frac{n !}{x !(n-x) !}$

D)
$\left\{ \begin{array} { c } \frac { e ^ { - \lambda } \lambda ^ { x } } { x ! } , \\0 , \quad \text { otherwise }\end{array} \text { for } x = 0,1,2 , \ldots \right.$